Source: https://codereviewguide.fyi/coderabbit-vs-semgrep-code/

[AI code review head-to-head library](https://codereviewguide.fyi/tool-comparisons/)

# CodeRabbit vs Semgrep Code

Semgrep Code provides pattern and taint rules, with CE and Pro analysis scopes. CodeRabbit uses AI review and repository guidance. Compare the requirement format and cross-file needs before choosing; the tools can serve different parts of the same PR workflow.

Code Review Guide · Reviewed October 14, 2026 · Published by Perch / Verglas LLC

## CodeRabbit and Semgrep Code at a glance

Documented review inputs, requirements and licensing

| Decision | CodeRabbit | Semgrep Code |
| --- | --- | --- |
| Review scope | Pull requests, local changes, and agent-loop review. | CE scans within files; Pro adds cross-file analysis. |
| Local review input | CLI and IDE review committed and uncommitted changes. | Local and CI CLI with open CE and paid Pro analysis. |
| Custom requirements | Guideline files and natural-language pre-merge checks; custom-check allowances depend on plan. | YAML pattern, taint and custom-rule configuration. |
| License and service | Commercial review service. | LGPL-2.1 CE engine; commercial Pro engine. |
| Official references | [CodeRabbit sources](https://codereviewguide.fyi/coderabbit-vs-semgrep-code/#sources-coderabbit) | [Semgrep Code sources](https://codereviewguide.fyi/coderabbit-vs-semgrep-code/#sources-semgrep-code) |

## Choose pattern and taint rules or prose review guidance

Express one requirement as a Semgrep rule and as review guidance, then test a positive and negative example. Record CE versus Pro scope and the maintenance needed for the rule.

### CodeRabbit billing

Essentials: $24/user/month billed annually, or $30 monthly. Public-repository reviews are free.

Essentials annual subscription floor; 1 repository and 5 included reviews/developer/hour. Eligible extra reviews cost 25¢ per reviewed file. Built-in checks are included; custom pre-merge checks start on Team.

[CodeRabbit plan sources and workload assumptions](https://reviewpricing.fyi/coderabbit/)

### Semgrep Code billing

Teams Code: $30/contributor/month. Free supports 10 repositories and 10 contributors.

Teams Code subscription floor; free-tier eligibility and other Semgrep products can change the bill. Semantic checks and security analyzers cover different requirements.

[Semgrep Code plan sources and workload assumptions](https://reviewpricing.fyi/semgrep-code/)

Subscription amounts are plan floors or quoted allowances. Repeated reviews, selected effort, provider charges and exclusions can change the bill. Equal review counts do not establish equal analysis scope.

A third option for the agent’s next edit

## When Perch is the better choice

Perch is a stronger fit when the behavior is easier to state in English than a structural pattern. Save the requirement as a named method or file check and repeat it after the agent repair.

For an agent that repeatedly removes tenant authorization from a database update, save the requirement as a named Perch rule:

```
- name: tenant-scoped-update
  where: "orders.py"
  ensure: >-
    The cancellation UPDATE must constrain tenant_id to actor.tenant_id
    before changing the order. An id-only or owner-only update breaks
    this requirement.
```

This requirement comes from the [FastAPI tenant-authorization recipe](https://frameworkrecipes.dev/fastapi/tenant-cancellation/), which includes the implementation, deliberate regression and captured Perch checks. The same named check can run against the working file after the next agent edit. [Perch working-file checks](https://github.com/lakeday-org/perch/blob/main/docs/check.md) support selecting rules directly; [rule selectors](https://github.com/lakeday-org/perch/blob/main/docs/rules.md) cover project, file and method scope.

### Install, configure the agent, check and repair

```
npm install -g @lakeday/perch
perch login
perch setup claude-code
# Or choose: perch setup codex
# Or choose: perch setup cursor
```

Use the setup command for your coding agent. Download the focused pack without replacing existing files:

```
curl -fL 'https://reporules.fyi/fastapi/tenant-cancellation/rule-pack.zip' -o tenant-rule.zip
unzip -n tenant-rule.zip
perch check orders.py --rules tenant-scoped-update --json
# Repair the reported finding after the agent edit.
perch check orders.py --rules tenant-scoped-update --json
```

Keep your existing root perch.yaml. The ZIP adds its focused rule under .perch/rules/; unzip -n preserves existing files. Review and adapt the selector and application path before running it in your repository. Run the saved check after an edit, repair any finding, and repeat the identical check alongside application regression tests.

[Download the tenant-authorization rule pack](https://reporules.fyi/fastapi/tenant-cancellation/rule-pack.zip) · [Inspect pack contents and agent task](https://reporules.fyi/fastapi/tenant-cancellation/)

### Pay for fresh checks, reuse unchanged answers

Perch charges 10¢ per 1,000 fresh rule checks, with no developer seat fees. Cached unchanged checks are free. About 50¢ per mid-sized PR is a rounded estimate for approximately 150 methods read at the captured September–October 2026 density of 34 questions per method; the unrounded example is 51¢. A single named-rule check is a different scope. [Team workload calculations](https://reviewpricing.fyi/team-review-costs/) show the assumptions.

The [Perch CLI is MIT licensed](https://github.com/lakeday-org/perch/blob/main/LICENSE); hosted analysis is paid and relevant source is sent to the configured model service. Fresh model judgments can vary. Unchanged requests can reuse cached results.

## Test the same requirement before choosing

1. Use one authorized public change with a known regression and a clean control. Pin the base and reviewed code, and keep the documented requirement available to both tools.
2. Record each tool’s configuration, reviewed files, review effort, findings and false positives. Record cost and elapsed time from the actual run.
3. Repair the regression and repeat the relevant review. For Perch, preserve existing configuration, run the saved rule after the edit, and repeat the same check after repairing a finding.

This article compares documented product workflows and terms. The [public evaluation materials](https://reviewbenchmarks.dev/evaluations/order-service/) include captured Perch requirement checks; authenticated CodeRabbit and Greptile runs remain unscored. They do not establish a measured accuracy ranking between these tools.

## Sources and related comparisons

Reviewed October 14, 2026. Unverified features are marked as unverified rather than treated as absent. Current terms and actual trial results should determine a purchase.

### CodeRabbit documentation

- [www.coderabbit.ai/pricing](https://www.coderabbit.ai/pricing)
- [docs.coderabbit.ai/pr-reviews/custom-checks](https://docs.coderabbit.ai/pr-reviews/custom-checks)
- [docs.coderabbit.ai/overview/ide-cli-review](https://docs.coderabbit.ai/overview/ide-cli-review)
- [docs.coderabbit.ai/knowledge-base/code-guidelines](https://docs.coderabbit.ai/knowledge-base/code-guidelines)
- [docs.coderabbit.ai/cli](https://docs.coderabbit.ai/cli)
- [docs.coderabbit.ai/management/plans](https://docs.coderabbit.ai/management/plans)

### Semgrep Code documentation

- [semgrep.dev/pricing/](https://semgrep.dev/pricing/)
- [semgrep.dev/docs/usage-limits/](https://semgrep.dev/docs/usage-limits/)
- [semgrep.dev/docs/semgrep-ci/sample-ci-configs](https://semgrep.dev/docs/semgrep-ci/sample-ci-configs)
- [github.com/semgrep/semgrep/blob/develop/LICENSE](https://github.com/semgrep/semgrep/blob/develop/LICENSE)
- [semgrep.dev/docs/writing-rules/glossary](https://semgrep.dev/docs/writing-rules/glossary)
- [semgrep.dev/docs/writing-rules/rule-ideas](https://semgrep.dev/docs/writing-rules/rule-ideas)

### Continue comparing

- [CodeRabbit vs Greptile](https://codereviewguide.fyi/coderabbit-vs-greptile/)
- [CodeRabbit vs Qodo](https://codereviewguide.fyi/coderabbit-vs-qodo/)
- [CodeRabbit vs Macroscope](https://codereviewguide.fyi/coderabbit-vs-macroscope/)
- [CodeRabbit vs Cursor Bugbot](https://codereviewguide.fyi/coderabbit-vs-cursor-bugbot/)
- [CodeRabbit vs Kodus](https://codereviewguide.fyi/coderabbit-vs-kodus/)
- [CodeRabbit vs Cubic](https://codereviewguide.fyi/coderabbit-vs-cubic/)
- [Perch vs CodeRabbit](https://codereviewguide.fyi/perch-vs-coderabbit/)
- [Perch vs Semgrep Code](https://codereviewguide.fyi/perch-vs-semgrep-code/)

**Code Review Guide**

Tools & workflows.

Published by Perch · © 2026 Verglas LLC. Code Review Guide is a Perch publication.

Perch’s MIT license covers the CLI; hosted model analysis is a paid service. Relevant source is sent to the configured model service.

[Perch CLI MIT license](https://github.com/lakeday-org/perch/blob/main/LICENSE) · [Article text](https://codereviewguide.fyi/coderabbit-vs-semgrep-code/index.md) · [Resource index](https://codereviewguide.fyi/llms.txt)